2 * sys-linux.c - System-dependent procedures for setting up
3 * PPP interfaces on Linux systems
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 #include <sys/ioctl.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
25 #include <sys/errno.h>
28 #include <sys/utsname.h>
44 /* This is in netdevice.h. However, this compile will fail miserably if
45 you attempt to include netdevice.h because it has so many references
46 to __memcpy functions which it should not attempt to do. So, since I
47 really don't use it, but it must be defined, define it now. */
50 #define MAX_ADDR_LEN 7
54 #include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
56 #include <net/if_arp.h>
57 #include <net/route.h>
58 #include <netinet/if_ether.h>
60 #include <linux/types.h>
62 #include <linux/if_arp.h>
63 #include <linux/route.h>
64 #include <linux/if_ether.h>
66 #include <netinet/in.h>
67 #include <arpa/inet.h>
69 #include <linux/ppp_defs.h>
70 #include <linux/if_ppp.h>
75 #include "patchlevel.h"
79 #if __GLIBC__ >= 2 && \
80 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
81 #include <netipx/ipx.h>
83 #include <linux/ipx.h>
85 #endif /* IPX_CHANGE */
88 #include <sys/locks.h>
91 #ifndef RTF_DEFAULT /* Normally in <linux/route.h> from <net/route.h> */
95 /* We can get an EIO error on an ioctl if the modem has hung up */
96 #define ok_error(num) ((num)==EIO)
98 static int tty_disc = N_TTY; /* The TTY discipline */
99 static int ppp_disc = N_PPP; /* The PPP discpline */
100 static int initfdflags = -1; /* Initial file descriptor flags for fd */
101 static int ppp_fd = -1; /* fd which is set to PPP discipline */
102 static int sock_fd = -1; /* socket for doing interface ioctls */
103 static int slave_fd = -1;
104 static int master_fd = -1;
106 static fd_set in_fds; /* set of fds that wait_input waits for */
107 static int max_in_fd; /* highest fd set in in_fds */
109 static int has_proxy_arp = 0;
110 static int driver_version = 0;
111 static int driver_modification = 0;
112 static int driver_patch = 0;
113 static int driver_is_old = 0;
114 static int restore_term = 0; /* 1 => we've munged the terminal */
115 static struct termios inittermios; /* Initial TTY termios */
117 static char loop_name[20];
118 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
120 static int if_is_up; /* Interface has been marked up */
121 static u_int32_t default_route_gateway; /* Gateway for default route added */
122 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
123 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
125 static struct utsname utsname; /* for the kernel version */
126 static int kernel_version;
127 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
131 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
132 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
133 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
135 /* Prototypes for procedures local to this file. */
136 static int get_flags (void);
137 static void set_flags (int flags);
138 static int translate_speed (int bps);
139 static int baud_rate_of (int speed);
140 static char *path_to_route (void);
141 static void close_route_table (void);
142 static int open_route_table (void);
143 static int read_route_table (struct rtentry *rt);
144 static int defaultroute_exists (struct rtentry *rt);
145 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
146 char *name, int namelen);
147 static void decode_version (char *buf, int *version, int *mod, int *patch);
148 static int set_kdebugflag(int level);
149 static int ppp_registered(void);
151 extern u_char inpacket_buf[]; /* borrowed from main.c */
154 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
158 #define SET_SA_FAMILY(addr, family) \
159 memset ((char *) &(addr), '\0', sizeof(addr)); \
160 addr.sa_family = (family);
163 * Determine if the PPP connection should still be present.
168 static void set_ppp_fd (int new_fd)
170 SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
174 static int still_ppp(void)
176 if (!hungup || ppp_fd == slave_fd)
179 set_ppp_fd(slave_fd);
185 /********************************************************************
187 * Functions to read and set the flags value in the device driver
190 static int get_flags (void)
194 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
195 if ( ok_error (errno) )
198 fatal("ioctl(PPPIOCGFLAGS): %m");
201 SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
205 /********************************************************************/
207 static void set_flags (int flags)
209 SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
211 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
212 if (! ok_error (errno) )
213 fatal("ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno);
217 /********************************************************************
219 * sys_init - System-dependent initialization.
224 int osmaj, osmin, ospatch;
226 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
227 setlogmask(LOG_UPTO(LOG_INFO));
229 setlogmask(LOG_UPTO(LOG_DEBUG));
231 /* Get an internet socket for doing socket ioctls. */
232 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
234 if ( ! ok_error ( errno ))
235 fatal("Couldn't create IP socket: %m(%d)", errno);
242 osmaj = osmin = ospatch = 0;
243 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
244 kernel_version = KVERSION(osmaj, osmin, ospatch);
247 /********************************************************************
249 * sys_cleanup - restore any system state we modified before exiting:
250 * mark the interface down, delete default route and/or proxy arp entry.
251 * This shouldn't call die() because it's called from die().
254 void sys_cleanup(void)
257 * Take down the device
262 * Delete any routes through the device.
264 if (default_route_gateway != 0)
265 cifdefaultroute(0, 0, default_route_gateway);
268 cifproxyarp(0, proxy_arp_addr);
271 /********************************************************************
273 * sys_close - Clean up in a child process before execing.
287 /********************************************************************
289 * set_kdebugflag - Define the debugging level for the kernel
292 static int set_kdebugflag (int requested_level)
294 if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0) {
295 if ( ! ok_error (errno) )
296 error("ioctl(PPPIOCSDEBUG): %m");
299 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
304 /********************************************************************
306 * establish_ppp - Turn the serial port into a ppp interface.
309 int establish_ppp (int tty_fd)
313 * The current PPP device will be the tty file.
317 * Ensure that the tty device is in exclusive mode.
319 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
320 if ( ! ok_error ( errno ))
321 warn("ioctl(TIOCEXCL): %m");
324 * Demand mode - prime the old ppp device to relinquish the unit.
326 if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0)
327 fatal("ioctl(transfer ppp unit): %m(%d)", errno);
329 * Set the current tty to the PPP discpline
331 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0) {
332 if ( ! ok_error (errno) )
333 fatal("ioctl(TIOCSETD): %m(%d)", errno);
336 * Find out which interface we were given.
338 if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0) {
339 if ( ! ok_error (errno))
340 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
343 * Check that we got the same unit again.
347 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
352 * Enable debug in the driver if requested.
355 set_kdebugflag (kdebugflag);
357 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
358 SC_RCV_EVNP | SC_RCV_ODDP));
360 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
361 driver_version, driver_modification, driver_patch));
363 * Fetch the initial file flags and reset blocking mode on the file.
365 initfdflags = fcntl(ppp_fd, F_GETFL);
367 if (initfdflags == -1 ||
368 fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
369 if ( ! ok_error (errno))
370 warn("Couldn't set device to non-blocking mode: %m");
376 /********************************************************************
378 * disestablish_ppp - Restore the serial port to normal operation.
379 * This shouldn't call die() because it's called from die().
382 void disestablish_ppp(int tty_fd)
386 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
388 if (tcflush(tty_fd, TCIOFLUSH) < 0)
389 warn("tcflush failed: %m");
391 * Restore the previous line discipline
393 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
394 if ( ! ok_error (errno))
395 error("ioctl(TIOCSETD, N_TTY): %m");
398 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
399 if ( ! ok_error (errno))
400 warn("ioctl(TIOCNXCL): %m(%d)", errno);
403 /* Reset non-blocking mode on fd. */
404 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
405 if ( ! ok_error (errno))
406 warn("Couldn't restore device fd flags: %m");
412 /********************************************************************
414 * clean_check - Fetch the flags for the device and generate
415 * appropriate error messages.
417 void clean_check(void)
423 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
425 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
427 case SC_RCV_B7_0 | SC_RCV_EVNP:
428 case SC_RCV_B7_0 | SC_RCV_ODDP:
429 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
430 s = "all had bit 7 set to 1";
434 case SC_RCV_B7_1 | SC_RCV_EVNP:
435 case SC_RCV_B7_1 | SC_RCV_ODDP:
436 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
437 s = "all had bit 7 set to 0";
441 s = "all had odd parity";
445 s = "all had even parity";
450 warn("Receive serial link is not 8-bit clean:");
451 warn("Problem: %s", s);
459 * List of valid speeds.
463 int speed_int, speed_val;
540 /********************************************************************
542 * Translate from bits/second to a speed_t.
545 static int translate_speed (int bps)
547 struct speed *speedp;
550 for (speedp = speeds; speedp->speed_int; speedp++) {
551 if (bps == speedp->speed_int)
552 return speedp->speed_val;
554 warn("speed %d not supported", bps);
559 /********************************************************************
561 * Translate from a speed_t to bits/second.
564 static int baud_rate_of (int speed)
566 struct speed *speedp;
569 for (speedp = speeds; speedp->speed_int; speedp++) {
570 if (speed == speedp->speed_val)
571 return speedp->speed_int;
577 /********************************************************************
579 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
580 * at the requested speed, etc. If `local' is true, set CLOCAL
581 * regardless of whether the modem option was specified.
584 void set_up_tty(int tty_fd, int local)
590 if (tcgetattr(tty_fd, &tios) < 0) {
591 if (!ok_error(errno))
592 fatal("tcgetattr: %m(%d)", errno);
599 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
600 tios.c_cflag |= CS8 | CREAD | HUPCL;
602 tios.c_iflag = IGNBRK | IGNPAR;
606 tios.c_cc[VTIME] = 0;
609 tios.c_cflag ^= (CLOCAL | HUPCL);
613 tios.c_cflag |= CRTSCTS;
617 tios.c_iflag |= IXON | IXOFF;
618 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
619 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
623 tios.c_cflag &= ~CRTSCTS;
630 speed = translate_speed(inspeed);
632 cfsetospeed (&tios, speed);
633 cfsetispeed (&tios, speed);
636 * We can't proceed if the serial port speed is B0,
637 * since that implies that the serial port is disabled.
640 speed = cfgetospeed(&tios);
642 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
645 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
646 if (!ok_error(errno))
647 fatal("tcsetattr: %m");
649 baud_rate = baud_rate_of(speed);
653 /********************************************************************
655 * setdtr - control the DTR line on the serial port.
656 * This is called from die(), so it shouldn't call die().
659 void setdtr (int tty_fd, int on)
661 int modembits = TIOCM_DTR;
663 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
666 /********************************************************************
668 * restore_tty - restore the terminal to the saved settings.
671 void restore_tty (int tty_fd)
676 * Turn off echoing, because otherwise we can get into
677 * a loop with the tty and the modem echoing to each other.
678 * We presume we are the sole user of this tty device, so
679 * when we close it, it will revert to its defaults anyway.
682 inittermios.c_lflag &= ~(ECHO | ECHONL);
684 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
685 if (! ok_error (errno))
686 warn("tcsetattr: %m");
691 /********************************************************************
693 * output - Output PPP packet.
696 void output (int unit, unsigned char *p, int len)
699 dbglog("sent %P", p, len);
701 if (write(ppp_fd, p, len) < 0) {
702 if (errno == EWOULDBLOCK || errno == ENOBUFS
703 || errno == ENXIO || errno == EIO || errno == EINTR)
704 warn("write: warning: %m (%d)", errno);
706 error("write: %m (%d)", errno);
710 /********************************************************************
712 * wait_input - wait until there is data available,
713 * for the length of time specified by *timo (indefinite
717 void wait_input(struct timeval *timo)
723 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
724 if (n < 0 && errno != EINTR)
725 fatal("select: %m(%d)", errno);
729 * add_fd - add an fd to the set that wait_input waits for.
739 * remove_fd - remove an fd from the set that wait_input waits for.
741 void remove_fd(int fd)
747 /********************************************************************
749 * wait_loop_output - wait until there is data available on the
750 * loopback, for the length of time specified by *timo (indefinite
753 void wait_loop_output(timo)
754 struct timeval *timo;
760 FD_SET(master_fd, &ready);
761 n = select(master_fd + 1, &ready, NULL, &ready, timo);
762 if (n < 0 && errno != EINTR)
763 fatal("select: %m(%d)", errno);
766 /********************************************************************
768 * wait_time - wait for a given length of time or until a
769 * signal is received.
773 struct timeval *timo;
777 n = select(0, NULL, NULL, NULL, timo);
778 if (n < 0 && errno != EINTR)
779 fatal("select: %m(%d)", errno);
783 /********************************************************************
785 * read_packet - get a PPP packet from the serial device.
788 int read_packet (unsigned char *buf)
792 len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
794 if (errno == EWOULDBLOCK || errno == EIO)
796 fatal("read: %m(%d)", errno);
801 /********************************************************************
803 * get_loop_output - get outgoing packets from the ppp device,
804 * and detect when we want to bring the real link up.
805 * Return value is 1 if we need to bring up the link, 0 otherwise.
808 get_loop_output(void)
811 int n = read(master_fd, inbuf, sizeof(inbuf));
814 if (loop_chars(inbuf, n))
816 n = read(master_fd, inbuf, sizeof(inbuf));
820 fatal("eof on loopback");
822 if (errno != EWOULDBLOCK)
823 fatal("read from loopback: %m(%d)", errno);
828 /********************************************************************
830 * ppp_send_config - configure the transmit characteristics of
834 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
839 SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
841 * Ensure that the link is still up.
846 * Set the MTU and other parameters for the ppp device
848 memset (&ifr, '\0', sizeof (ifr));
849 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
852 if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
853 fatal("ioctl(SIOCSIFMTU): %m(%d)", errno);
855 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
856 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
857 if (!ok_error(errno))
858 fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
863 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
864 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
865 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
869 /********************************************************************
871 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
874 void ppp_set_xaccm (int unit, ext_accm accm)
876 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
877 accm[0], accm[1], accm[2], accm[3]));
879 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
880 if ( ! ok_error (errno))
881 warn("ioctl(set extended ACCM): %m(%d)", errno);
885 /********************************************************************
887 * ppp_recv_config - configure the receive-side characteristics of
891 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
895 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
897 * If we were called because the link has gone down then there is nothing
898 * which may be done. Just return without incident.
903 * Set the receiver parameters
905 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
906 if ( ! ok_error (errno))
907 error("ioctl(PPPIOCSMRU): %m(%d)", errno);
910 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
911 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
912 if (!ok_error(errno))
913 error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
917 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
921 /********************************************************************
923 * ccp_test - ask kernel whether a given compression method
924 * is acceptable for use.
927 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
929 struct ppp_option_data data;
931 memset (&data, '\0', sizeof (data));
933 data.length = opt_len;
934 data.transmit = for_transmit;
936 if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
939 return (errno == ENOBUFS)? 0: -1;
942 /********************************************************************
944 * ccp_flags_set - inform kernel about the current state of CCP.
947 void ccp_flags_set (int unit, int isopen, int isup)
951 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
952 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
957 /********************************************************************
959 * get_idle_time - return how long the link has been idle.
966 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
969 /********************************************************************
971 * get_ppp_stats - return statistics for the link.
974 get_ppp_stats(u, stats)
976 struct pppd_stats *stats;
978 struct ifpppstatsreq req;
980 memset (&req, 0, sizeof (req));
982 req.stats_ptr = (caddr_t) &req.stats;
983 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
984 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
985 error("Couldn't get PPP statistics: %m");
988 stats->bytes_in = req.stats.p.ppp_ibytes;
989 stats->bytes_out = req.stats.p.ppp_obytes;
993 /********************************************************************
995 * ccp_fatal_error - returns 1 if decompression was disabled as a
996 * result of an error detected after decompression of a packet,
997 * 0 otherwise. This is necessary because of patent nonsense.
1000 int ccp_fatal_error (int unit)
1002 int x = get_flags();
1004 return x & SC_DC_FERROR;
1008 * path_to_route - determine the path to the proc file system data
1010 #define ROUTE_MAX_COLS 12
1011 FILE *route_fd = (FILE *) 0;
1012 static char route_buffer [512];
1013 static int route_dev_col, route_dest_col, route_gw_col;
1014 static int route_flags_col, route_mask_col;
1015 static int route_num_cols;
1017 static char *path_to_route (void);
1018 static int open_route_table (void);
1019 static void close_route_table (void);
1020 static int read_route_table (struct rtentry *rt);
1022 /********************************************************************
1024 * path_to_procfs - find the path to the proc file system mount point
1027 static int path_to_procfs (void)
1029 struct mntent *mntent;
1032 fp = fopen(MOUNTED, "r");
1034 /* Default the mount location of /proc */
1035 strlcpy (route_buffer, "/proc", sizeof (route_buffer));
1039 while ((mntent = getmntent(fp)) != NULL) {
1040 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1042 if (strcmp(mntent->mnt_type, "proc") == 0)
1049 strlcpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer));
1053 /********************************************************************
1055 * path_to_route - find the path to the route tables in the proc file system
1058 static char *path_to_route (void)
1060 if (!path_to_procfs()) {
1061 error("proc file system not mounted");
1064 strlcat (route_buffer, "/net/route", sizeof(route_buffer));
1065 return (route_buffer);
1068 /********************************************************************
1070 * close_route_table - close the interface to the route table
1073 static void close_route_table (void)
1075 if (route_fd != (FILE *) 0) {
1077 route_fd = (FILE *) 0;
1081 /********************************************************************
1083 * open_route_table - open the interface to the route table
1085 static char route_delims[] = " \t\n";
1087 static int open_route_table (void)
1091 close_route_table();
1093 path = path_to_route();
1097 route_fd = fopen (path, "r");
1098 if (route_fd == NULL) {
1099 error("can't open %s: %m (%d)", path, errno);
1103 route_dev_col = 0; /* default to usual columns */
1106 route_flags_col = 3;
1110 /* parse header line */
1111 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1112 char *p = route_buffer, *q;
1114 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1116 if ((q = strtok(p, route_delims)) == 0)
1118 if (strcasecmp(q, "iface") == 0)
1119 route_dev_col = col;
1120 else if (strcasecmp(q, "destination") == 0)
1121 route_dest_col = col;
1122 else if (strcasecmp(q, "gateway") == 0)
1124 else if (strcasecmp(q, "flags") == 0)
1125 route_flags_col = col;
1126 else if (strcasecmp(q, "mask") == 0)
1127 route_mask_col = col;
1130 if (used && col >= route_num_cols)
1131 route_num_cols = col + 1;
1139 /********************************************************************
1141 * read_route_table - read the next entry from the route table
1144 static int read_route_table(struct rtentry *rt)
1146 char *cols[ROUTE_MAX_COLS], *p;
1149 memset (rt, '\0', sizeof (struct rtentry));
1151 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1155 for (col = 0; col < route_num_cols; ++col) {
1156 cols[col] = strtok(p, route_delims);
1157 if (cols[col] == NULL)
1158 return 0; /* didn't get enough columns */
1161 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1162 strtoul(cols[route_dest_col], NULL, 16);
1164 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1165 strtoul(cols[route_gw_col], NULL, 16);
1167 ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr =
1168 strtoul(cols[route_mask_col], NULL, 16);
1170 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1171 rt->rt_dev = cols[route_dev_col];
1176 /********************************************************************
1178 * defaultroute_exists - determine if there is a default route
1181 static int defaultroute_exists (struct rtentry *rt)
1185 if (!open_route_table())
1188 while (read_route_table(rt) != 0) {
1189 if ((rt->rt_flags & RTF_UP) == 0)
1192 if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) {
1198 close_route_table();
1203 * have_route_to - determine if the system has any route to
1204 * a given IP address. `addr' is in network byte order.
1205 * Return value is 1 if yes, 0 if no, -1 if don't know.
1206 * For demand mode to work properly, we have to ignore routes
1207 * through our own interface.
1209 int have_route_to(u_int32_t addr)
1214 if (!open_route_table())
1215 return -1; /* don't know */
1217 while (read_route_table(&rt)) {
1218 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1220 if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr)
1221 == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) {
1227 close_route_table();
1231 /********************************************************************
1233 * sifdefaultroute - assign a default route through the address given.
1236 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1240 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1241 struct in_addr old_gateway =
1242 ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr;
1244 if (old_gateway.s_addr != gateway)
1245 error("not replacing existing default route to %s [%I]",
1246 rt.rt_dev, old_gateway);
1250 memset (&rt, '\0', sizeof (rt));
1251 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1252 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1254 if (kernel_version > KVERSION(2,1,0)) {
1255 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1256 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1259 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1261 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1262 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1263 if ( ! ok_error ( errno ))
1264 error("default route ioctl(SIOCADDRT): %m(%d)", errno);
1268 default_route_gateway = gateway;
1272 /********************************************************************
1274 * cifdefaultroute - delete a default route through the address given.
1277 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1281 default_route_gateway = 0;
1283 memset (&rt, '\0', sizeof (rt));
1284 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1285 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1287 if (kernel_version > KVERSION(2,1,0)) {
1288 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1289 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1292 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1294 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1295 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1297 if ( ! ok_error ( errno ))
1298 error("default route ioctl(SIOCDELRT): %m (%d)", errno);
1306 /********************************************************************
1308 * sifproxyarp - Make a proxy ARP entry for the peer.
1311 int sifproxyarp (int unit, u_int32_t his_adr)
1313 struct arpreq arpreq;
1315 if (has_proxy_arp == 0) {
1316 memset (&arpreq, '\0', sizeof(arpreq));
1318 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1319 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1320 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1322 * Get the hardware address of an interface on the same subnet
1323 * as our local address.
1325 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1326 sizeof(proxy_arp_dev))) {
1327 error("Cannot determine ethernet address for proxy ARP");
1330 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1332 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1333 if ( ! ok_error ( errno ))
1334 error("ioctl(SIOCSARP): %m(%d)", errno);
1337 proxy_arp_addr = his_adr;
1344 /********************************************************************
1346 * cifproxyarp - Delete the proxy ARP entry for the peer.
1349 int cifproxyarp (int unit, u_int32_t his_adr)
1351 struct arpreq arpreq;
1353 if (has_proxy_arp) {
1355 memset (&arpreq, '\0', sizeof(arpreq));
1356 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1357 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1358 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1359 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1361 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1362 if ( ! ok_error ( errno ))
1363 warn("ioctl(SIOCDARP): %m(%d)", errno);
1370 /********************************************************************
1372 * get_ether_addr - get the hardware address of an interface on the
1373 * the same subnet as ipaddr.
1376 static int get_ether_addr (u_int32_t ipaddr,
1377 struct sockaddr *hwaddr,
1378 char *name, int namelen)
1380 struct ifreq *ifr, *ifend;
1381 u_int32_t ina, mask;
1384 struct ifreq ifs[MAX_IFS];
1386 ifc.ifc_len = sizeof(ifs);
1388 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1389 if ( ! ok_error ( errno ))
1390 error("ioctl(SIOCGIFCONF): %m(%d)", errno);
1394 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1395 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1397 * Scan through looking for an interface with an Internet
1398 * address on the same subnet as `ipaddr'.
1400 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1401 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1402 if (ifr->ifr_addr.sa_family == AF_INET) {
1403 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1404 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1405 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1408 * Check that the interface is up, and not point-to-point
1411 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1414 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1417 * Get its netmask and check that it's on the right subnet.
1419 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1422 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1423 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1424 ip_ntoa(ina), ntohl(mask)));
1426 if (((ipaddr ^ ina) & mask) != 0)
1435 strlcpy(name, ifreq.ifr_name, namelen);
1436 info("found interface %s for proxy arp", name);
1438 * Now get the hardware address.
1440 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1441 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1442 error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1448 sizeof (struct sockaddr));
1450 SYSDEBUG ((LOG_DEBUG,
1451 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1452 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1453 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1454 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1455 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1456 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1457 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1458 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1459 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1463 /********************************************************************
1465 * Return user specified netmask, modified by any mask we might determine
1466 * for address `addr' (in network byte order).
1467 * Here we scan through the system's list of interfaces, looking for
1468 * any non-point-to-point interfaces which might appear to be on the same
1469 * network as `addr'. If we find any, we OR in their netmask to the
1470 * user-specified netmask.
1473 u_int32_t GetMask (u_int32_t addr)
1475 u_int32_t mask, nmask, ina;
1476 struct ifreq *ifr, *ifend, ifreq;
1478 struct ifreq ifs[MAX_IFS];
1482 if (IN_CLASSA(addr)) /* determine network mask for address class */
1483 nmask = IN_CLASSA_NET;
1484 else if (IN_CLASSB(addr))
1485 nmask = IN_CLASSB_NET;
1487 nmask = IN_CLASSC_NET;
1489 /* class D nets are disallowed by bad_ip_adrs */
1490 mask = netmask | htonl(nmask);
1492 * Scan through the system's network interfaces.
1494 ifc.ifc_len = sizeof(ifs);
1496 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1497 if ( ! ok_error ( errno ))
1498 warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
1502 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1503 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1505 * Check the interface's internet address.
1507 if (ifr->ifr_addr.sa_family != AF_INET)
1509 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1510 if (((ntohl(ina) ^ addr) & nmask) != 0)
1513 * Check that the interface is up, and not point-to-point nor loopback.
1515 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1516 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1519 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1522 * Get its netmask and OR it into our mask.
1524 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1526 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1532 /********************************************************************
1534 * Internal routine to decode the version.modification.patch level
1537 static void decode_version (char *buf, int *version,
1538 int *modification, int *patch)
1540 *version = (int) strtoul (buf, &buf, 10);
1546 *modification = (int) strtoul (buf, &buf, 10);
1549 *patch = (int) strtoul (buf, &buf, 10);
1560 /********************************************************************
1562 * Procedure to determine if the PPP line discipline is registered.
1566 ppp_registered(void)
1574 * We used to open the serial device and set it to the ppp line
1575 * discipline here, in order to create a ppp unit. But that is
1576 * not a good idea - the user might have specified a device that
1577 * they can't open (permission, or maybe it doesn't really exist).
1578 * So we grab a pty master/slave pair and use that.
1580 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1581 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1586 * Try to put the device into the PPP discipline.
1588 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1589 error("ioctl(TIOCSETD(PPP)): %m(%d)", errno);
1598 /********************************************************************
1600 * ppp_available - check whether the system has any ppp interfaces
1601 * (in fact we check whether we can do an ioctl on ppp0).
1604 int ppp_available(void)
1609 int my_version, my_modification, my_patch;
1612 "This system lacks kernel support for PPP. This could be because\n"
1613 "the PPP kernel module could not be loaded, or because PPP was not\n"
1614 "included in the kernel configuration. If PPP was included as a\n"
1615 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1616 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1617 "See README.linux file in the ppp distribution for more details.\n";
1620 * Open a socket for doing the ioctl operations.
1622 s = socket(AF_INET, SOCK_DGRAM, 0);
1626 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1627 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1629 * If the device did not exist then attempt to create one by putting the
1630 * current tty into the PPP discipline. If this works then obtain the
1631 * flags for the device again.
1634 if (ppp_registered()) {
1635 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1636 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1640 * Ensure that the hardware address is for PPP and not something else
1643 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1645 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1649 * This is the PPP device. Validate the version of the driver at this
1650 * point to ensure that this program will work with the driver.
1653 char abBuffer [1024];
1655 ifr.ifr_data = abBuffer;
1656 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1658 error("Couldn't read driver version: %m");
1660 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
1663 decode_version(abBuffer,
1665 &driver_modification,
1668 * Validate the version of the driver against the version that we used.
1670 decode_version(VERSION,
1675 /* The version numbers must match */
1676 if (driver_version != my_version)
1679 /* The modification levels must be legal */
1680 if (driver_modification < 3) {
1681 if (driver_modification >= 2) {
1682 /* we can cope with 2.2.0 and above */
1691 slprintf(route_buffer, sizeof(route_buffer),
1692 "Sorry - PPP driver version %d.%d.%d is out of date\n",
1693 driver_version, driver_modification, driver_patch);
1695 no_ppp_msg = route_buffer;
1702 /********************************************************************
1704 * Update the wtmp file with the appropriate user name and tty device.
1707 void logwtmp (const char *line, const char *name, const char *host)
1710 struct utmp ut, *utp;
1711 pid_t mypid = getpid();
1713 * Update the signon database for users.
1714 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
1716 utmpname(_PATH_UTMP);
1718 while ((utp = getutent()) && (utp->ut_pid != mypid))
1721 /* Is this call really necessary? There is another one after the 'put' */
1725 memcpy(&ut, utp, sizeof(ut));
1727 /* some gettys/telnetds don't initialize utmp... */
1728 memset(&ut, 0, sizeof(ut));
1730 if (ut.ut_id[0] == 0)
1731 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
1733 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
1734 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1738 ut.ut_type = USER_PROCESS;
1741 /* Insert the host name if one is supplied */
1743 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
1745 /* Insert the IP address of the remote system if IP is enabled */
1746 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
1747 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
1748 sizeof(ut.ut_addr));
1750 /* CL: Makes sure that the logout works */
1751 if (*host == 0 && *name==0)
1757 * Update the wtmp file.
1759 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
1761 flock(wtmp, LOCK_EX);
1763 /* we really should check for error on the write for a full disk! */
1764 write (wtmp, (char *)&ut, sizeof(ut));
1767 flock(wtmp, LOCK_UN);
1772 /********************************************************************
1773 * Code for locking/unlocking the serial device.
1774 * This code is derived from chat.c.
1778 #define LOCK_PREFIX "/var/lock/LCK.."
1781 static char *lock_file;
1784 * lock - create a lock file for the named device
1787 int lock (char *dev)
1791 lock_file = strdup(dev);
1792 if (lock_file == NULL)
1793 novm("lock file name");
1794 result = mklock (dev, (void *) 0);
1797 notice("Device %s is locked by pid %d", dev, result);
1804 error("Can't create lock file %s", lock_file);
1812 char hdb_lock_buffer[12];
1818 p = strrchr(dev, '/');
1822 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1823 lock_file = malloc(l);
1824 if (lock_file == NULL)
1825 novm("lock file name");
1827 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1829 * Attempt to create the lock file at this point.
1832 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1836 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%010d\n", pid);
1837 write (fd, hdb_lock_buffer, 11);
1839 write(fd, &pid, sizeof (pid));
1845 * If the file exists then check to see if the pid is stale
1847 if (errno == EEXIST) {
1848 fd = open(lock_file, O_RDONLY, 0);
1850 if (errno == ENOENT) /* This is just a timing problem. */
1855 /* Read the lock file to find out who has the device locked */
1856 n = read (fd, hdb_lock_buffer, 11);
1859 error("Can't read pid from lock file %s", lock_file);
1863 /* See the process still exists. */
1866 hdb_lock_buffer[n] = '\0';
1867 sscanf (hdb_lock_buffer, " %d", &pid);
1869 pid = ((int *) hdb_lock_buffer)[0];
1871 if (pid == 0 || pid == getpid()
1872 || (kill(pid, 0) == -1 && errno == ESRCH))
1876 /* If the process does not exist then try to remove the lock */
1877 if (n == 0 && unlink (lock_file) == 0) {
1878 notice("Removed stale lock on %s (pid %d)",
1883 notice("Device %s is locked by pid %d", dev, pid);
1887 error("Can't create lock file %s: %m(%d)", lock_file, errno);
1898 /********************************************************************
1900 * unlock - remove our lockfile
1907 (void) rmlock (lock_file, (void *) 0);
1917 /********************************************************************
1919 * sifvjcomp - config tcp header compression
1922 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
1924 u_int x = get_flags();
1927 if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
1928 if (! ok_error (errno))
1929 error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
1934 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
1935 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
1941 /********************************************************************
1943 * sifup - Config the interface up and enable IP packets to pass.
1950 memset (&ifr, '\0', sizeof (ifr));
1951 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1952 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1953 if (! ok_error (errno))
1954 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1958 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
1959 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1960 if (! ok_error (errno))
1961 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1968 /********************************************************************
1970 * sifdown - Config the interface down and disable IP.
1979 memset (&ifr, '\0', sizeof (ifr));
1980 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1981 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1982 if (! ok_error (errno))
1983 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1987 ifr.ifr_flags &= ~IFF_UP;
1988 ifr.ifr_flags |= IFF_POINTOPOINT;
1989 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1990 if (! ok_error (errno))
1991 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1997 /********************************************************************
1999 * sifaddr - Config the interface IP addresses and netmask.
2002 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2008 memset (&ifr, '\0', sizeof (ifr));
2009 memset (&rt, '\0', sizeof (rt));
2011 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2012 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2013 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2015 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2017 * Set our IP address
2019 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
2020 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2021 if (errno != EEXIST) {
2022 if (! ok_error (errno))
2023 error("ioctl(SIOCSIFADDR): %m(%d)", errno);
2026 warn("ioctl(SIOCSIFADDR): Address already exists");
2031 * Set the gateway address
2033 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
2034 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2035 if (! ok_error (errno))
2036 error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2041 * For recent kernels, force the netmask to 255.255.255.255.
2043 if (kernel_version >= KVERSION(2,1,16))
2045 if (net_mask != 0) {
2046 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
2047 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2048 if (! ok_error (errno))
2049 error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2054 * Add the device route
2056 if (kernel_version < KVERSION(2,1,16)) {
2057 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2058 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2061 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
2062 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2063 rt.rt_flags = RTF_UP | RTF_HOST;
2065 if (kernel_version > KVERSION(2,1,0)) {
2066 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2067 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2070 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2071 if (! ok_error (errno))
2072 error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
2079 /********************************************************************
2081 * cifaddr - Clear the interface IP addresses, and delete routes
2082 * through the interface if possible.
2085 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2089 if (kernel_version < KVERSION(2,1,16)) {
2091 * Delete the route through the device
2093 memset (&rt, '\0', sizeof (rt));
2095 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2096 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2099 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
2100 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2101 rt.rt_flags = RTF_UP | RTF_HOST;
2103 if (kernel_version > KVERSION(2,1,0)) {
2104 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2105 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2108 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2109 if (still_ppp() && ! ok_error (errno))
2110 error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
2118 * get_pty - get a pty master/slave pair and chown the slave side
2119 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
2122 get_pty(master_fdp, slave_fdp, slave_name, uid)
2130 struct termios tios;
2133 for (i = 0; i < 64; ++i) {
2134 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2135 'p' + i / 16, i % 16);
2136 mfd = open(pty_name, O_RDWR, 0);
2139 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2148 strlcpy(slave_name, pty_name, 12);
2151 fchown(sfd, uid, -1);
2152 fchmod(sfd, S_IRUSR | S_IWUSR);
2153 if (tcgetattr(sfd, &tios) == 0) {
2154 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2155 tios.c_cflag |= CS8 | CREAD;
2156 tios.c_iflag = IGNPAR | CLOCAL;
2159 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2160 warn("couldn't set attributes on pty: %m");
2162 warn("couldn't get attributes on pty: %m");
2167 /********************************************************************
2169 * open_loopback - open the device we use for getting packets
2170 * in demand mode. Under Linux, we use a pty master/slave pair.
2173 open_ppp_loopback(void)
2177 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2178 fatal("No free pty for loopback");
2179 SYSDEBUG(("using %s for loopback", loop_name));
2181 set_ppp_fd(slave_fd);
2183 flags = fcntl(master_fd, F_GETFL);
2185 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2186 warn("couldn't set master loopback to nonblock: %m(%d)", errno);
2188 flags = fcntl(ppp_fd, F_GETFL);
2190 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2191 warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
2193 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2194 fatal("ioctl(TIOCSETD): %m(%d)", errno);
2196 * Find out which interface we were given.
2198 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2199 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
2201 * Enable debug in the driver if requested.
2203 set_kdebugflag (kdebugflag);
2208 /********************************************************************
2210 * restore_loop - reattach the ppp unit to the loopback.
2212 * The kernel ppp driver automatically reattaches the ppp unit to
2213 * the loopback if the serial port is set to a line discipline other
2214 * than ppp, or if it detects a modem hangup. The former will happen
2215 * in disestablish_ppp if the latter hasn't already happened, so we
2216 * shouldn't need to do anything.
2218 * Just to be sure, set the real serial port to the normal discipline.
2224 if (ppp_fd != slave_fd) {
2225 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2226 set_ppp_fd(slave_fd);
2230 /********************************************************************
2232 * sifnpmode - Set the mode for handling packets for a given NP.
2236 sifnpmode(u, proto, mode)
2243 npi.protocol = proto;
2245 if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2246 if (! ok_error (errno)) {
2247 error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
2248 proto, mode, errno);
2249 error("ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
2257 /********************************************************************
2259 * sipxfaddr - Config the interface IPX networknumber
2262 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2269 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2271 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2273 if (! ok_error (errno))
2274 dbglog("socket(AF_IPX): %m (%d)", errno);
2278 memset (&ifr, '\0', sizeof (ifr));
2279 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2281 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2282 sipx->sipx_family = AF_IPX;
2283 sipx->sipx_port = 0;
2284 sipx->sipx_network = htonl (network);
2285 sipx->sipx_type = IPX_FRAME_ETHERII;
2286 sipx->sipx_action = IPX_CRTITF;
2288 * Set the IPX device
2290 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2292 if (errno != EEXIST) {
2293 if (! ok_error (errno))
2294 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (%d)", errno);
2297 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2306 /********************************************************************
2308 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2309 * are removed and the device is no longer able to pass IPX
2313 int cipxfaddr (int unit)
2320 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2322 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2324 if (! ok_error (errno))
2325 dbglog("socket(AF_IPX): %m (%d)", errno);
2329 memset (&ifr, '\0', sizeof (ifr));
2330 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2332 sipx->sipx_type = IPX_FRAME_ETHERII;
2333 sipx->sipx_action = IPX_DLTITF;
2334 sipx->sipx_family = AF_IPX;
2336 * Set the IPX device
2338 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2339 if (! ok_error (errno))
2340 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (%d)", errno);
2351 * daemon - Detach us from controlling terminal session.
2354 daemon(nochdir, noclose)
2355 int nochdir, noclose;
2359 if ((pid = fork()) < 0)
2362 exit(0); /* parent dies */
2367 fclose(stdin); /* don't need stdin, stdout, stderr */
2376 * Use the hostname as part of the random number seed.
2385 for (p = hostname; *p != 0; ++p)
2390 /********************************************************************
2392 * sys_check_options - check the options that the user specified
2396 sys_check_options(void)
2399 struct stat stat_buf;
2401 * Disable the IPX protocol if the support is not present in the kernel.
2402 * If we disable it then ensure that IP support is enabled.
2404 while (ipxcp_protent.enabled_flag) {
2405 if (path_to_procfs()) {
2406 strlcat (route_buffer, "/net/ipx_interface", sizeof(route_buffer));
2407 if (lstat (route_buffer, &stat_buf) >= 0)
2410 error("IPX support is not present in the kernel\n");
2411 ipxcp_protent.enabled_flag = 0;
2412 ipcp_protent.enabled_flag = 1;
2416 if (demand && driver_is_old) {
2417 option_error("demand dialling is not supported by kernel driver "
2418 "version %d.%d.%d", driver_version, driver_modification,